The new BPSK63 and QPSK63 modes derive from BPSK31/QPSK31 but they are twice faster. The minimum ratio Signal-to-Noise ratio is about - 7 / -8 dB. The PSK63F is similar to PSK63 but
with a convolutional encoding.

This mode is included into the software MULTIPSK by Patrick F6CTE, there is the description of this mode and its variants as well as the specifications coming from his software :

A CW prefix, at 12
or 20 wpm, indicating mode, software and power used, for example: "VVV DE F6CTE / MODE PSK63F
/ SOFT
MULTIPSK / PWR: 5 WATTS" could be transmitted before the CQ call
itself. The option of the video identifier of mode, now included
in MULTIPSK, permits to specify visually in CMT
Hell the mode label (and/or other information) before the main
transmission. This identifier will be visible in the "waterfall" of the
other Ham. For example, just before the general call ("CQ") inPSK63F, it will be sent automatically "PSK63F" in CMT Hell. The other Ham will see "PSK63F" displaying on his "waterfall" and will switch immediately to PSK63F.